CN108842736A - A kind of agricultural ecological irrigation canals and ditches and its construction method - Google Patents
A kind of agricultural ecological irrigation canals and ditches and its construction method Download PDFInfo
- Publication number
- CN108842736A CN108842736A CN201810017690.XA CN201810017690A CN108842736A CN 108842736 A CN108842736 A CN 108842736A CN 201810017690 A CN201810017690 A CN 201810017690A CN 108842736 A CN108842736 A CN 108842736A
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- Prior art keywords
- ditches
- irrigation canals
- bottom plate
- revetment brick
- side slope
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B13/00—Irrigation ditches, i.e. gravity flow, open channel water distribution systems
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
- A01G31/02—Special apparatus therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Abstract
The invention discloses a kind of agricultural ecological irrigation canals and ditches, side slope including bottom plate and positioned at the bottom plate two sides, interlocking revetment brick of the side slope by being located at the mortar flag stone of inside and positioned at outside forms, and the mortar flag stone is reserved with pit, and the interlocking revetment brick is laid in the pit.Agricultural ecological irrigation canals and ditches of the invention, it is precipitated by irrigation canals and ditches, the modes such as bio-absorbable purify waste water, most of nutriment in water body, tiny organism by breeding biology ingest sorption enhanced decompose, the eutrophic extent of water body reduces, nitrogen and phosphorus content is substantially reduced, purify water quality, realize the blocking to water pollution substance, degradation, it absorbs, it utilizes, reach polluter in reduction discharge water body, improve farmland nitrogen, phosphorus utilization, it is a kind of economical and efficient, it is simple and practical, ecological canal system that is easy to maintain and promoting, it can produce preferable social and economic benefit, with great application prospect.
Description
Technical field
The present invention relates to water and treat agricultural waste, environmental protection technical field, in particular to a kind of agricultural ecological irrigation canals and ditches and its
Construction method.
Background technique
With advances in technology, expanding economy also promotes the fast development of agricultural, the amount of application increasing of chemical fertilizer and pesticide
Add, however problem of environmental pollution caused by the increase of fertilizers input amount also becomes increasingly conspicuous, it is this based on a large amount chemical fertilizer investment
Agriculture Production Modes also directly accelerate the consumption of important natural resources, and environmental problem is got worse, and make to resident's daily life
At baneful influence, non-point source pollution loading proportion increases year by year, becomes one of main source of water pollution, and have become and work as
This life circle generally existing serious environmental problems.
Existing sewage treatment plant is due to processing cost and standing charges valuableness and often in intermittent duty or at all
The state not run leads to the deterioration increasingly of waste and the environmental pollution of a large amount of construction funds.In addition, traditional activated sludge process
Then very little to the removal of the nutriments such as nitrogen phosphorus to remove based on carbon source pollutant, water outlet is easily drawn after being discharged into environment water
The problems such as playing eutrophication.
Therefore, cost-effective farmland N and P losses resistance control measure is studied and defined, the dirts such as nitrogen, phosphorus in agricultural drain are cut down
Object load is contaminated, for containing water eutrophication, basin society and sustainable economic development is promoted to be of great significance.
Growth has plant in traditional Earthen ditches, has the functions such as certain adsorption by soil, plant absorption and biodegrade,
Have certain to nitrogen and phosphorus pollutants but is not significantly to remove very much function, it is miscellaneous in irrigation canals and ditches but after operation after a period of time
Thick grass life, severe water and soil erosion, water flow are unsmooth, and the removal effect of nitrogen and phosphorus pollutants cannot fully ensure that, thus to it is subsequent by
Water body of receiving still causes centainly to pollute.At present peasant pass through frequently with three face light hardening of cement irrigation canals and ditches main functions be farmland tail water
Discharge-channel, though hardening irrigation canals and ditches are easy to maintain, substantially not long plant in it, the removal to pollutants such as nitrogen phosphorus in the tail water of farmland
Ability is weak, and water velocity is fast, and residence time of the farmland tail water in irrigation canals and ditches is very short, therefore the dirts such as nitrogen phosphorus in the tail water of farmland
Dye object is difficult to be sufficiently removed in irrigation canals and ditches.As it can be seen that traditional Earthen ditches and three face light hardening of cement irrigation canals and ditches are in the tail water of farmland
Nitrogen and phosphorus pollutants self-purification capacity it is weak so that the agricultural non-point source pollution presentation based on the tail water of farmland is on the rise trend.
In recent years, researcher both domestic and external starts using ecological canal as a kind of control agricultural non-point source pollution（Nitrogen and
Phosphorus）One of main means, and it was found that have the effect of plant raw irrigation canals and ditches can play and preferably cut phosphorus and cut nitrogen,
Ditch wetland can retain the nitrogen and phosphorus in absorption, plant absorption and microbial degradation reduction water body by bed mud.
But domestic and foreign scholars are concentrated mainly on purification mechanism, the ecological ditch of ecological canal to the research of ecological canal at present
The clean-up effect of canal planting plants, the hydrologic effect of irrigation canals and ditches, environmental effect and biological effect etc., and the section in relation to irrigation canals and ditches
The researchs such as growth of form Design, irrigation canals and ditches plant then seem relatively weak.
The ecological canal invented because of agricultural non-point source pollution and people contradictory area differentiation, takes up a large area, and lacks general
It is remained to be further improved all over the problems such as usability and sustainable utilization.Therefore, how a kind of ecological canal system, control nitrogen are provided
The irrigation canals and ditches of phosphorus pollution, can either provide suitable growing environment, and can be effectively improved crop-planting process for irrigation canals and ditches implants
The phenomenon that middle nitrogen P elements number of dropouts is big, surrounding body eutrophication is serious, becomes the skill of those skilled in the art's urgent need to resolve
Art problem.
Summary of the invention
In view of this, to solve the above-mentioned problems and overcoming the deficiencies of existing technologies, the object of the present invention is to provide one
Kind agricultural ecological irrigation canals and ditches, can purify water, be substantially reduced the content of nitrogen and phosphorous in water body, realize to water pollution substance
Blocking, degradation, absorption, utilization, reach reduction discharge water body in polluter, improve farmland nitrogen, phosphorus utilization, daily maintenance
Simply, convenient for management, operational management is at low cost.
In order to achieve the above objectives, the following technical solution is employed by the present invention：
A kind of agricultural ecological irrigation canals and ditches, the side slope including bottom plate and positioned at the bottom plate two sides, the side slope is by being located inside
Mortar flag stone and interlocking revetment brick positioned at outside form, and the mortar flag stone is reserved with pit, the interlocking slope protection
Brick is laid in the pit.
Preferably, the bottom plate is formed by concreting, the bottom plate with a thickness of 0.2-0.6m.
It is further preferred that being reserved with the implantation hole through the bottom plate on the bottom plate, kind is implanted with water in the implantation hole
Plant.
It is further preferred that the water plant is yellow flag, rush, thaliadeabata, iris, oenanthe stolonifera, swamp cabbage, hay
Any one or more in white, canna glauca, hornwort, p.malaianus and edible seaweed.
Preferably, the side slope with a thickness of 0.3-0.5m, the gradient of the side slope is 1:0.5-1:1.5, i.e. side slope
Horizontal width is 0.5-1.5 times of the vertical height of side slope.
Preferably, through-hole is offered in the interlocking revetment brick, interior kind of the through-hole is implanted with slope-protecting plant.
It is further preferred that the interlocking revetment brick is the regular hexagon of hollow out, to increase between interlocking revetment brick
Stability.
It is further preferred that the interlocking revetment brick with a thickness of 0.05-0.15m.
Preferably, the cross-sectional shape of the ecological canal is inverted trapezoidal, the top of the ecological canal to the bottom plate
The vertical height at top is 0.8-1.8m, and top width degree is 1.0-3.0m, and bottom width degree is 0.3-1.5m.
The present invention also provides a kind of construction methods of agricultural ecological irrigation canals and ditches as described above, include the following steps：
1）Existing irrigation canals and ditches are rebuild according to the size of ecological canal or newly dig irrigation canals and ditches；
2）Side slope uses mortar flag stone revetment, and the reserved pit for being laid with interlocking revetment brick, later on the pit middle berth
Non-woven fabrics is then laid with interlocking revetment brick on the non-woven fabrics；
3）Slope-protecting plant is planted in the through-hole of interlocking revetment brick；
4）Bottom plate is formed by concreting in the bottom of ecological canal, and is reserved with implantation hole；
5）The planting aquatic plants in the implantation hole.
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
1. the bottom of ecological canal of the invention is the bottom plate of concreting, the side slope of two sides is by grouting piece positioned inside
Stone and positioned at outside interlocking revetment brick constitute, can effectively prevent leaking, prevent from causing secondary pollution；
2. being reserved with the implantation hole through bottom plate on the bottom plate of ecological canal of the invention, interior kind of implantation hole is implanted with water plant,
Interlocking revetment brick is the regular hexagon of hollow out, and also kind is implanted with slope-protecting plant in through-hole, by water plant in implantation hole and
Slope-protecting plant in side slope can effectively intercept the particulate matter in the tail water stream of farmland, extend the water conservancy residence time, increase pollutant
Removal efficiency can largely retain nitrogen phosphorus compound, especially ammonia nitrogen；Slope-protecting plant can not only play interception particle
The effect of pollutant and purifying water body, while also there is landscape effect；
3. ecological canal material therefor of the invention is that stone, concrete, plant and interlocking revetment brick, source are easy to get, at
This is cheap, and construction method is simple, and without complicated technology, daily maintenance is simple, and convenient for management, operational management is at low cost, is easy to real
Existing and popularization；
4. ecological canal of the invention can effectively be cut down suspended matter, nitrogen, phosphorus and be contained by the design of form, construction to irrigation canals and ditches
Amount；Existing farmland ditch space is made full use of, land resource has been saved；Facility structure is simple, is convenient for construction and later maintenance,
Construction cost is low.
Detailed description of the invention
Fig. 1 is the sectional view of the agricultural ecological irrigation canals and ditches of the preferred embodiment of the present invention；
Fig. 2 is the main view of interlocking revetment brick in the agricultural ecological irrigation canals and ditches of the preferred embodiment of the present invention；
Wherein：Side slope -1, mortar flag stone -2, pit -21, interlocking revetment brick -3, through-hole -31, bottom plate -4, implantation hole -41.
Specific embodiment
Technical solution of the present invention is further elaborated combined with specific embodiments below.
The structure of one agricultural ecological irrigation canals and ditches of embodiment
Reference attached drawing 1-2, a kind of agricultural ecological irrigation canals and ditches of the present embodiment, the side slope 1 including bottom plate 4 and positioned at 4 two sides of bottom plate,
Interlocking revetment brick 3 of the side slope 1 by being located at the mortar flag stone 2 of inside and positioned at outside forms, and mortar flag stone 2 is reserved with pit
21, interlocking revetment brick 3 is laid in pit 21.
Bottom plate 4 is formed by concreting, and is reserved with the implantation hole 41 through bottom plate 4 on bottom plate 4 when pouring, plantation
Kind is implanted with water plant in hole 41.Water plant be yellow flag, rush, thaliadeabata, iris, oenanthe stolonifera, swamp cabbage, wild rice stem,
Any one or more in canna glauca, hornwort, p.malaianus and edible seaweed.
Through-hole 31 is offered in interlocking revetment brick 3, interior kind of through-hole 31 is implanted with slope-protecting plant.In the interlocking close to bottom plate 4
Slope-protecting plant in the through-hole 31 of formula revetment brick 3 can be emergent aquactic plant, such as reed, wild rice stem, in the interlocking slope protection far from bottom plate 4
Slope-protecting plant in the through-hole 31 of brick 3 can be turf.Interlocking revetment brick 3 is the regular hexagon of hollow out, such as Fig. 2 in the present embodiment
It is shown, to increase the stability between interlocking revetment brick 3.
The cross-sectional shape of ecological canal is inverted trapezoidal, and the vertical height at top to 4 top of bottom plate of ecological canal is
0.8-1.8m, top width degree be 1.0-3.0m, bottom width degree be 0.3-1.5m, bottom plate 4 with a thickness of 0.2-0.6m, the gradient of side slope 1
It is 1:0.5-1:1.5, side slope 1 with a thickness of 0.3-0.5m, interlocking revetment brick 3 with a thickness of 0.05-0.15m.Such as Fig. 1 institute
Show, in the present embodiment, the vertical height at top to 4 top of bottom plate of ecological canal is 1.5m, and top width degree is 1.5m, bottom width degree
For 0.5m, bottom plate 4 with a thickness of 0.5m, the gradient of side slope 1 is 1:1, the i.e. vertical height of the horizontal width of side slope 1 and side slope 1
It is identical, side slope 1 with a thickness of 0.4m, wherein interlocking revetment brick 3 with a thickness of 0.1m.Such design method can effectively be cut
Subtract suspended matter, the content of nitrogen and phosphorous, makes full use of existing farmland ditch space, economize the land resource.
The construction method of two agricultural ecological irrigation canals and ditches of embodiment
The present embodiment additionally provides a kind of construction method of agricultural ecological irrigation canals and ditches as described above, specifically includes following steps：
Step S1：Existing irrigation canals and ditches are rebuild according to the size of ecological canal or newly dig irrigation canals and ditches.
The vertical height at the top of ecological canal to 4 top of bottom plate is 1.5m, and top width degree is 1.5m, and bottom width degree is 0.5m,
Bottom plate 4 with a thickness of 0.5m, the gradient of side slope 1 is 1:1, i.e. the horizontal width of side slope 1 is identical as the vertical height of side slope 1, side
Slope 1 with a thickness of 0.4m, wherein interlocking revetment brick 3 with a thickness of 0.1m.Such design method can effectively cut down suspension
Object, the content of nitrogen and phosphorous make full use of existing farmland ditch space, economize the land resource.
Step S2：Side slope 1 uses mortar flag stone revetment 2, and the reserved pit 21, Zhi Hou for being laid with interlocking revetment brick 3
Non-woven fabrics on 21 pit middle berths is then laid with interlocking revetment brick 3 on non-woven fabrics.
Interlocking revetment brick 3 is the regular hexagon of hollow out in the present embodiment, as shown in Fig. 2, to increase interlocking revetment brick 3
Between stability.
Step S3：Slope-protecting plant is planted in the through-hole 31 of interlocking revetment brick 3.
Slope-protecting plant in the through-hole 31 close to the interlocking revetment brick 3 of bottom plate 4 can be emergent aquactic plant, such as reed, hay
White, the slope-protecting plant in the through-hole 31 of the interlocking revetment brick 3 far from bottom plate 4 can be turf.
Step S4：Bottom plate 4 is formed by concreting in the bottom of ecological canal, and is reserved with the kind through bottom plate 4
Plant hole 41.
Step S5：The planting aquatic plants in implantation hole 41.
Water plant is yellow flag, rush, thaliadeabata, iris, oenanthe stolonifera, swamp cabbage, wild rice stem, canna glauca, gold
Any one or more in fish algae, p.malaianus and edible seaweed.
The ecological canal of 1m is laid with 3m in the present embodiment2Interlocking revetment brick 3 plants 16 calamus and 16 irises.
Three implementation result of embodiment
COD in former farmland tail waterCr50~100mg/L of concentration, ammonia nitrogen concentration 1.8~2.4mg/L, TN concentration 2.5~4mg/L, TP
Concentration is 0.8~1.8mg/L.
After the agricultural ecological irrigation canals and ditches in the present invention, farmland tail water CODCr18~42mg/L of concentration, ammonia nitrogen concentration 0.5~
1.8mg/L, TN concentration 1.1~2.0mg/L, TP concentration are 0.2~0.6mg/L.
The present invention is at least up to 40% or more to the mean concentration cut rate of total nitrogen in the tail water of farmland, total phosphorus.
Agricultural ecological irrigation canals and ditches of the invention purify waste water by modes such as irrigation canals and ditches precipitating, bio-absorbables, the big portion in water body
Point nutriment, tiny organism are decomposed by breeding biology sorption enhanced of ingesting, and the eutrophic extent of water body reduces, nitrogen and phosphorus content
It is substantially reduced, purifies water quality, realize to the blocking of water pollution substance, degradation, absorption, utilization, reach reduction row
Polluter in water-outlet body improves farmland nitrogen, phosphorus utilization, is a kind of economical and efficient, simple and practical, easy to maintain and promote
Ecological canal system can produce preferable social and economic benefit, have great application prospect.
The bottom of ecological canal of the invention is the bottom plate of concreting, and the side slope of two sides is by grouting piece positioned inside
Stone and positioned at outside interlocking revetment brick constitute, can effectively prevent leaking, prevent from causing secondary pollution；It is reserved on bottom plate
Kind it is implanted with water plant through the implantation hole of bottom plate, in implantation hole, interlocking revetment brick is the regular hexagon of hollow out, in through-hole
Kind is implanted with slope-protecting plant, can effectively intercept farmland tail water stream by the slope-protecting plant on the water plant and side slope in implantation hole
In particulate matter, extend the water conservancy residence time, increase contaminant removal efficiency, can largely retain nitrogen phosphatization conjunction
Object, especially ammonia nitrogen；Slope-protecting plant can not only play the role of intercepting particulate pollutant and purifying water body, while also have landscape
Effect；Material therefor is that stone, concrete, plant and interlocking revetment brick, source are easy to get, low in cost, construction method letter
Single, without complicated technology, daily maintenance is simple, and convenient for management, operational management is at low cost, it is easy to accomplish and promote；By right
Form, the design of construction of irrigation canals and ditches, can effectively cut down suspended matter, the content of nitrogen and phosphorous；Existing farmland ditch space is made full use of,
Land resource is saved；Facility structure is simple, low convenient for construction and later maintenance, construction cost.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand the contents of the present invention and be implemented, and it is not intended to limit the scope of the present invention, it is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the scope of protection of the present invention.
Claims (10)
1. a kind of agricultural ecological irrigation canals and ditches, which is characterized in that the side slope including bottom plate and positioned at the bottom plate two sides, the side slope
Interlocking revetment brick by being located at the mortar flag stone of inside and positioned at outside forms, and the mortar flag stone is reserved with pit, institute
Interlocking revetment brick is stated to be laid in the pit.
2. a kind of agricultural ecological irrigation canals and ditches according to claim 1, which is characterized in that the bottom plate by concreting and
At, the bottom plate with a thickness of 0.2-0.6m.
3. a kind of agricultural ecological irrigation canals and ditches according to claim 2, which is characterized in that be reserved on the bottom plate through described
The implantation hole of bottom plate, kind is implanted with water plant in the implantation hole.
4. a kind of agricultural ecological irrigation canals and ditches according to claim 3, which is characterized in that the water plant is yellow flag, lamp
Appointing in core grass, thaliadeabata, iris, oenanthe stolonifera, swamp cabbage, wild rice stem, canna glauca, hornwort, p.malaianus and edible seaweed
It anticipates one or more.
5. a kind of agricultural ecological irrigation canals and ditches according to claim 1, which is characterized in that the side slope with a thickness of 0.3-
0.5m, the gradient of the side slope are 1:0.5-1:1.5.
6. a kind of agricultural ecological irrigation canals and ditches according to claim 1, which is characterized in that offered in the interlocking revetment brick
Through-hole, interior kind of the through-hole is implanted with slope-protecting plant.
7. a kind of agricultural ecological irrigation canals and ditches according to claim 6, which is characterized in that the interlocking revetment brick is hollow out
Regular hexagon.
8. a kind of agricultural ecological irrigation canals and ditches according to claim 6, which is characterized in that the interlocking revetment brick with a thickness of
0.05-0.15m。
9. a kind of agricultural ecological irrigation canals and ditches according to claim 1, which is characterized in that the cross-sectional shape of the ecological canal
For inverted trapezoidal, the vertical height at the top of the top to the bottom plate of the ecological canal is 0.8-1.8m, and top width degree is 1.0-
3.0m, bottom width degree are 0.3-1.5m.
10. a kind of construction method of agricultural ecological irrigation canals and ditches described in -9 any one according to claim 1, which is characterized in that packet
Include following steps：
1）Existing irrigation canals and ditches are rebuild according to the size of ecological canal or newly dig irrigation canals and ditches；
2）Side slope uses mortar flag stone revetment, and the reserved pit for being laid with interlocking revetment brick, later on the pit middle berth
Non-woven fabrics is then laid with interlocking revetment brick on the non-woven fabrics；
3）Slope-protecting plant is planted in the through-hole of interlocking revetment brick；
4）Bottom plate is formed by concreting in the bottom of ecological canal, and is reserved with implantation hole；
5）The planting aquatic plants in the implantation hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810017690.XA CN108842736A (en) | 2018-01-09 | 2018-01-09 | A kind of agricultural ecological irrigation canals and ditches and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017690.XA CN108842736A (en) | 2018-01-09 | 2018-01-09 | A kind of agricultural ecological irrigation canals and ditches and its construction method |
Publications (1)
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| CN108842736A true CN108842736A (en) | 2018-11-20 |
Family
ID=64211740
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067239A (en) * | 2019-04-18 | 2019-07-30 | 太仓市农业技术推广中心 | A kind of farmland tail water ecological recycle system |
| CN110862192A (en) * | 2019-11-25 | 2020-03-06 | 天津市环境保护科学研究院 | Ecological anti-fouling and slope protection method for protecting water source |
| CN111087080A (en) * | 2019-12-20 | 2020-05-01 | 南京大学盐城环保技术与工程研究院 | Efficient phosphorus removal ecological ditch aiming at farmland non-point source pollution and paving method thereof |
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| CN103321195A (en) * | 2012-08-23 | 2013-09-25 | 上海市环境科学研究院 | Farmland ecologic interception ditch adopting slope protection technology and construction method of ditch |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067239A (en) * | 2019-04-18 | 2019-07-30 | 太仓市农业技术推广中心 | A kind of farmland tail water ecological recycle system |
| CN110862192A (en) * | 2019-11-25 | 2020-03-06 | 天津市环境保护科学研究院 | Ecological anti-fouling and slope protection method for protecting water source |
| CN110862192B (en) * | 2019-11-25 | 2022-02-15 | 天津市生态环境科学研究院(天津市环境规划院、天津市低碳发展研究中心) | Ecological anti-fouling and slope protection method for protecting water source |
| CN111087080A (en) * | 2019-12-20 | 2020-05-01 | 南京大学盐城环保技术与工程研究院 | Efficient phosphorus removal ecological ditch aiming at farmland non-point source pollution and paving method thereof |
| CN111087080B (en) * | 2019-12-20 | 2022-06-03 | 南京大学盐城环保技术与工程研究院 | Efficient phosphorus removal ecological ditch aiming at farmland non-point source pollution and paving method thereof |
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Application publication date: 20181120 |